it probably has to do with the way their mind works. They think that a game must worth the 60 dollars they spend on, and by that they probably mean somewhere along the length of some sandbox titles like Gran Theft Auto. Now, most of this people don't really think of replay values until they have beaten the game, so often times they want to know how much stuff they can do in one playthrough. The more stuff they can cram in one playthrough, the more it seems there is so much stuff to do in the game. Then again, I've played games that lasted me over 30 hours and I thought a lot of it was just fillers and waste of opportunities, and I really hate that because then it feels like you paid 60 dollars to suffer. It's entirely subjective, but people are always trying to convert it into a standard and that's really dumb. Sometimes I want a f**king 3 hour game even if it meant spending 60 dollars for it. In the end, what matters to me is the game, not the length.